Thinking about starting a collection
LOL, a collection is not something you plan, it's more something that grows organically. Like a virus
I think it starts for most people because they like to own something they used to work with when it was new, amazing and completely out of their (financial) reach. That's how I got my first Indy back in the nineties. You mess with it, if you like it you buy another, at some point you run out of space and sell the things that don't appeal to you anymore. Or you have to narrow your scope -- at some point I owned PA-RISC, SPARC and AXP hardware and a lot of SUN storage -- now it's only SGI (OK, I still have an IBM DS4000 SAN and a Dell PowerVault).
At least that's what happened to me -- and I own a fairly substantial collection of SGI's
So, go ahead and buy that one thing you always dreamed of owning. Then see where it goes from there. I hope you have some friends or better half to tell you when enough is enough